Thunderstorms with heavy rain hit northern Navajo and northern Apache Counties. Flash flooding covered highways around Kayenta northward toward Monument Valley and near Round Rock.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS FGZ wrote it up.
Thunderstorms with heavy rain hit northern Navajo and northern Apache Counties. Flash flooding covered highways around Kayenta northward toward Monument Valley and near Round Rock.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Flagstaff, AZ wrote its last area forecast discussion before the first event at Sep 11, 4:00 AM MST, 4 hours earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 400 AM MST WED SEP 11 2013 .SYNOPSIS...FOR TODAY...AN UPPER LEVEL LOW OVER NORTHWEST ARIZONA WILL PRODUCE NUMEROUS SHOWERS AND THUNDERSTORMS ACROSS COCONINO AND YAVAPAI COUNTIES WITH SCATTERED STORMS ELSEWHERE. ON THURSDAY... DRIER AIR MOVING IN FROM WEST TO EAST WILL BRING DECREASING STORM COVERAGE. EXPECT FAIR WEATHER FOR THE WEEKEND WITH JUST A SLIGHT CHANCE OF AFTERNOON STORMS ALONG THE MOGOLLON RIM AND APACHE COUNTY. && .DISCUSSION...AN UPPER LEVEL LOW PRESSURE SYSTEM REMAINS OVER NORTHWEST ARIZONA EARLY THIS MORNING...WITH WIDELY SCATTERED SHOWERS ACROSS COCONINO COUNTY. FOR TODAY...PROGS ARE IN GOOD AGREEMENT MOVING THE UPPER LOW SLOWLY NORTHWARD INTO UTAH. FORECAST SOUNDINGS DO SHOW A BIT OF COOLING ALOFT UNDER THE LOW...AND WHEN COMBINED WITH THE EXISTING MOISTURE NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED BY THIS AFTERNOON WEST OF A LINE FROM PAGE TO PAYSON. SCATTERED STORMS ARE FORECAST FOR MOST OF NAVAJO AND APACHE COUNTY. MODEL QPF ARE MUCH LOWER FOR TODAY THAN THE LAST 3 AND DO NOT SUGGEST THE NEED FOR A FLASH FLOOD WATCH. THURSDAY THROUGH SUNDAY... PROGS ARE MOVING THE UPPER LOW CIRCULATION FURTHER NORTH AND AWAY FROM AZ. WEAK CYCLONIC FLOW OVER THE AREA CONTINUES THROUGH FRIDAY AND LINGERING LOW LEVEL MOISTURE FORCES A CHANCE OF SHOWERS AND THUNDERSTORMS WITH ACTIVITY CONFINED TO THE LATE MORNING THROUGH SUNSET TIME FRAME. FOR THE WEEKEND...DEEP NORTHWEST TO WEST FLOW ALOFT MOVES IN AND PUSHES ANY REMAINING MOISTURE TO THE NEW MEXICO LINE. AT THIS TIME WE EXPECT WIDELY SCATTERED DAYTIME STORMS ALONG AND NORTH OF THE RIM SATURDAY AND THEN JUST A SLIGHT CHANCE OF AFTERNOON STORMS SUNDAY ACROSS APACHE COUNTY. MONDAY AND TUESDAY. LEFT A SLIGHT CHANCE OF AFTERNOON STORMS OVER THE WHITE MTNS MONDAY OTHERWISE LIGHT AND DRY WESTERLY FLOW ALOFT WILL BRING MOSTLY CLEAR SKIES AND NEAR NORMAL TEMPERATURES. && .AVIATION....FOR THE 12Z PACKAGE...EXPECT WIDESPREAD LOW CLOUDS WITH SCT -SHRA/BR WEST OF A LINE FROM KSOW TO KFLG AND NORTHWARD TO KPGA. CIGS WILL RANGE FROM 2-4KFT AGL WITH CIGS BLO 1KFT AGL NEAR ANY SHOWERS. THIS WILL TRANSITION TO SCT-NMRS -SHRA/TSRA WITH ISOLD +TSRA AFT 18Z. EAST OF THIS LINE...SKC-SCT CLOUD COVER WILL BECOME SCT -SHRA/-TSRA AFT 17Z-19Z. ACTIVITY WILL DIMINISH TONIGHT...WITH SOME LOW CLOUDS AND FOG DEVELOPING. AVIATION DISCUSSION NOT UPDATED FOR AMENDMENTS. && .FGZ WATCHES/WARNINGS/ADVISORIES...NONE. && PUBLIC.....DL AVIATION...PETERSON FOR NORTHERN ARIZONA WEATHER INFORMATION VISIT WEATHER.GOV/FLAGSTAFF
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 423 AM MST WED SEP 11 2013 AZZ004>018-037>040-120700- KAIBAB PLATEAU-MARBLE AND GLEN CANYONS-GRAND CANYON COUNTRY- COCONINO PLATEAU-YAVAPAI COUNTY MOUNTAINS- NORTHEAST PLATEAUS AND MESAS HWY 264 NORTHWARD-CHINLE VALLEY- CHUSKA MOUNTAINS AND DEFIANCE PLATEAU- LITTLE COLORADO RIVER VALLEY IN COCONINO COUNTY- LITTLE COLORADO RIVER VALLEY IN NAVAJO COUNTY- LITTLE COLORADO RIVER VALLEY IN APACHE COUNTY- WESTERN MOGOLLON RIM-EASTERN MOGOLLON RIM-WHITE MOUNTAINS- NORTHERN GILA COUNTY-YAVAPAI COUNTY VALLEYS AND BASINS- OAK CREEK AND SYCAMORE CANYONS-BLACK MESA AREA- NORTHEAST PLATEAUS AND MESAS SOUTH OF HWY 264- 423 AM MST WED SEP 11 2013 THIS HAZARDOUS WEATHER OUTLOOK IS FOR APACHE...COCONINO... NORTHERN GILA...NAVAJO...AND YAVAPAI COUNTIES IN NORTHERN ARIZONA. .DAY ONE...TODAY NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED BY THIS AFTERNOON FOR AREAS WEST OF A LINE FROM PAGE TO PAYSON WITH SCATTERED STORM COVERAGE ELSEWHERE. THE WEATHER HAZARDS ARE LIGHTNING AND LOCALLY HEAVY RAINFALL. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY LOOK FOR DECREASING MOISTURE AND PRECIPITATION COVERAGE ACROSS WESTERN ARIZONA STARTING THURSDAY WITH MOISTURE BEING PUSHED SLOWLY EASTWARD WITH TIME THROUGH THE END OF THE WEEK. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. RB
The national radar mosaic for the moment the first event began.
2 flash flood. Local standard time, as filed.
Heavy rain caused flash flooding over Highway 191 near mile post 497.
Heavy rain produced flash flooding on Highway 160 near mile post 408 and on Highway 163 near mile post 400.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Arizona in 2013Every state in 2013This day in weather historyWarnings in Arizona, September 2013
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 479374, 479373.